If you sign up as a member of the Boeing World Design Team on www.newairplane.com
you will get e-mails about the live chats. Registration for the WDT is free.
By the way, Tamsin, the design of the 747 predated disco by a few years. And I certainly hope the "disco" or club-style floor is indeed a joke. However, Boeing has stated that they will have some kind of unique entrance on the 787; perhaps they will add a full light-panel and mirror-ball setup too!